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JPS5765097

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DESCRIPTION JPS5765097
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a speaker diaphragm
and provides a speaker diaphragm capable of reducing high-frequency resonance peaks. When
the flat diaphragm is used as the diaphragm of the speaker, the above-mentioned effect is drifted,
so that flat frequency characteristics can be obtained up to the high frequency co-shooting point.
In order to expand the band, it is necessary to improve the specific elastic modulus (E / s) of the
diaphragm, but with the improvement of the specific elastic modulus, the high frequency
resonance also becomes large, and the woofer, squawker, tweeter as a speaker system In the case
of connecting etc., peak cut is performed electrically or used in a substantially narrow band.
Further, as another method of high-frequency coincidence peak cutting of the diaphragm, a
method of using a high mechanical loss member in combination with the surface material, or a
method of using a high mechanical loss member for the voice coil connection portion is used.
However, these methods lead to the reduction of the reproduction frequency band, and also have
the disadvantage that the efficiency is reduced due to the increase in weight. The present
invention eliminates the above-mentioned defects of the prior art -11 to realize the peak cut of
high-pass resonance efficiently, and exerts the effect in a flat-plate diaphragm of a sand-inch
structure in which a surface material is bonded to the surface of a core material. is there. The
feature of the present invention is to use one having a partial slit-like cut in the surface material
of the sandwich diaphragm. By selecting the position and size of the cutting shape 5 optimally,
the high frequency resonance peak can be greatly reduced without lowering the reproduction
frequency band EndPage: 13. Conventional examples and embodiments of the present invention
will be described below. [Conventional Example] In FIG. 1, reference numeral 1 denotes a
11-05-2019
1
honeycomb core, and surface materials 2 and 2 'made of aluminum foil of 30 .mu. The adhesion
by the film adhesive 3, 3 ? ? is made by interposing the film adhesive 3, 3 ░ between the core
material 1 and the surface material 2, 21 and melting the film adhesive 3, 31 by heating. It is
made to adhere and to make it. The completed diaphragm has a thickness of 3 mm, a diameter of
8 mm and a weight of 2.5 t. In FIG. 1, 4 is a cylindrical coil bobbin fixed to the lower surface of
the diaphragm, and a voice coil 6 is wound around the coil bobbin 4. The diaphragm is supported
by the frame through an edge member, and the voice coil 5 is inserted into the annular magnetic
gap of the magnetic circuit. ? As shown in FIGS. 2 and 3, it is similar to the conventional
example. The surface material 2, 21 is adhered to the front and back surfaces of the core
material 10 with the film adhesive 3, 31. In this embodiment, a partial slit-like cut portion
concentric to the surface material 2, 2 ░ is used. 6 is formed in 9 places.
In addition, the formation location of the cutting part 6 is a different location by the surface
materials 2 and 2 '. FIG. 4 shows the sound pressure frequency characteristics of the speaker a
using the above-mentioned conventional diaphragm and the speaker b using the diaphragm of
the present invention. When the slit-like cut portion 6 is formed, the peak value in the high
frequency resonance can be reduced to 1/4 or less of that of the conventional example, and
therefore, the sound pressure frequency characteristics flat to the high frequency can be
obtained. It is -In the above-mentioned example, although slit-like cutting part 6 is formed in both
surface materials 2 and 2 +, cutting part 6 may be formed only in one surface material. Further,
the shape of the cutting portion 6 is not limited to a circular shape, and a radial cutting portion
may be formed. In addition, in the case where the slit-like cut portion 6 is formed in both
surfaces 5- и material 2 and 21 and in the case where the cut portions are formed in the same
place, the rigidity of the diaphragm may decrease. In the case where the cut portion 6 is formed
at 2 ░ 2, it is preferable to form the cut portion at different places as in the embodiment shown
in FIG. The above embodiment is an example of a circular diaphragm, but the present invention is
not limited to the circular, and the same applies to a rectangular diaphragm or the like. The
present invention is configured as described above, and it is possible to reduce the peak value in
high frequency resonance, and to obtain sound pressure frequency characteristics that are flat to
high frequency.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a conventional speaker
diaphragm, FIG. 2 is a cross-sectional view of a speaker diaphragm in one embodiment of the
present invention, and FIG. The figure is a sound pressure frequency characteristic diagram of
the speaker using the diaphragm of the present invention and the conventional diaphragm. 1 иииииии
Heart material, 2.2 ? ииииииииииииииииииииииии Film adhesive, 4 иии ░░ coil bobbin, 6 иии иииииииииииииииииииииииииииииииииииии ?
Name of Attorney Attorney Nakao and one other EndPage: ?
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